Nur 421 Cardiac Exam Questions SOLVED 100%
CORRECT!!!
Four Properties of Cardiac Cells
1. Automaticity
2. Excitability
3. Conductivity
4. Contractility
Automaticity
the ability of cardiac pacemaker cells to spontaneously initiate an electrical impulse
- usually done by the SA node
Excitability
The ability of cardiac cells to respond to an electrical impulse generated by pacemaker cells or
other stimuli
Conductivity
The ability of cardiac cells to transmit the electrical impulse to adjacent cardiac cells
Contractility
the ability of the cardiac cells to shorten in response to electrical stimulation
Depolarization
The process during the action potential when sodium is rushing into the cell causing the interior
to become more positive.
Repolarization
Return of the cell to resting state, caused by reentry of potassium into the cell while sodium
exits the cell.
, are depolarization and contraction the same thing?
no depolarization is an electrical event and contraction is a mechanical event
Drugs that affect the cardiac action potential
1. Sodium channel blocker
2. beta blocker
3. potassium channel blocker
4. calcium channel blocker
examples of sodium channel blockers
IA: Procainamide, Quinidine, Disopyramide (antiarrhythmics)
IB: Lidocaine , Mexiletine, Tocainide
IC: Flecainide Propafenone
examples of beta blockers
-olols
examples of potassium channel blockers
amiodarone, sotalol
examples of calcium channel blockers
Verapamil, diltiazem, amlodipine, nifedipine (usually - dipine)
Phase 0 of action potential
- depolarization
- QRS wave
- na into cell
- cell is more positive
CORRECT!!!
Four Properties of Cardiac Cells
1. Automaticity
2. Excitability
3. Conductivity
4. Contractility
Automaticity
the ability of cardiac pacemaker cells to spontaneously initiate an electrical impulse
- usually done by the SA node
Excitability
The ability of cardiac cells to respond to an electrical impulse generated by pacemaker cells or
other stimuli
Conductivity
The ability of cardiac cells to transmit the electrical impulse to adjacent cardiac cells
Contractility
the ability of the cardiac cells to shorten in response to electrical stimulation
Depolarization
The process during the action potential when sodium is rushing into the cell causing the interior
to become more positive.
Repolarization
Return of the cell to resting state, caused by reentry of potassium into the cell while sodium
exits the cell.
, are depolarization and contraction the same thing?
no depolarization is an electrical event and contraction is a mechanical event
Drugs that affect the cardiac action potential
1. Sodium channel blocker
2. beta blocker
3. potassium channel blocker
4. calcium channel blocker
examples of sodium channel blockers
IA: Procainamide, Quinidine, Disopyramide (antiarrhythmics)
IB: Lidocaine , Mexiletine, Tocainide
IC: Flecainide Propafenone
examples of beta blockers
-olols
examples of potassium channel blockers
amiodarone, sotalol
examples of calcium channel blockers
Verapamil, diltiazem, amlodipine, nifedipine (usually - dipine)
Phase 0 of action potential
- depolarization
- QRS wave
- na into cell
- cell is more positive
